david753
Full Member level 1
Dear sir, I use ss2tf function in matlab. Its output values input to tf2ss function. But the result is not equal to the original input. (A1,B1,C1,D1) IS NOT EQUAL TO (A,B,C,D.)
What wrong is it?
clear;
A=[0 1 0;0 0 1;-9 -8 -7];
B=[7;8;9];
C=[2 3 4];
D=[0];
[num, den]=ss2tf(A,B,C,D,1);
[a1,b1,c1,d1]=tf2ss(num,den);
a1 =
-7.0000 -8.0000 -9.0000
1.0000 0 0
0 1.0000 0
b1 =
1
0
0
c1 =
74.0000 -199.0000 -235.0000
d1 =
0
What wrong is it?
clear;
A=[0 1 0;0 0 1;-9 -8 -7];
B=[7;8;9];
C=[2 3 4];
D=[0];
[num, den]=ss2tf(A,B,C,D,1);
[a1,b1,c1,d1]=tf2ss(num,den);
a1 =
-7.0000 -8.0000 -9.0000
1.0000 0 0
0 1.0000 0
b1 =
1
0
0
c1 =
74.0000 -199.0000 -235.0000
d1 =
0